build on sand

build (something) on sand

To create, provide, or use an unstable or impermanent foundation for something, such as a building, business, or relationship. It is taken from a parable in the Bible (Matthew 7:24–27 and Luke 6:46–49) in which Jesus warns that those who do not follow Him build their lives as houses on sand, liable to be washed away by the elements. In hindsight, I guess our relationship was kind of built on sand, since we didn't really have much in common to begin with.Without proper financing, you'll end up building your business on sand!

build on sand

Use an unstable foundation, as in If you buy nothing but high-risk stocks, your portfolio will be built on sand. This metaphor appears in the New Testament, where Jesus likens those who do not heed his sayings to a foolish man who builds his house on sand, which then is washed away by rain, flood, and wind (Matthew 7:24-27). [c. 1600]

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